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ID:43619448
大小:3.99 MB
页数:62页
时间:2019-10-11
《内科护理学课件英语考试资料dysrhythmias》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Dysrhythmia心律失常Propertiesofcardiactissue心脏组织的特性Automaticity自律性:abilitytoinitiateanimpulsespontaneouslyandcontinuously.Excitability兴奋性:abilitytobeelectricallystimulated.Contractility收缩性:abilitytorespondmechanicallytoanimpulse.Conductivity传导性:abilitytotransmita
2、nimpulsealongamembraneinanorderlymanner.Conductionsystem:abriefreview传导系统PwavebeginswiththefiringoftheSAnodeandrepresentsdepolarization去极化ofthefibersoftheatria心房,resultinginatrialcontraction心房收缩.TheQRScomplexrepresentsdepolarization去极化oftheventricles心室,result
3、inginventricularcontraction心室收缩.TheTwaverepresentsrepolarization复极oftheventricles心室,orthetimeatwhichtheventriclesreturntotheprestimulatedstate.Conductionsystem:abriefreviewIntervals波间隔betweenthesewavesreflectsthelengthsoftimeittakesfortheimpulsestotravelfromo
4、neareaofthehearttotheother.ThePRintervalrepresentstheperiodduringwhichtheimpulsespreadsthroughtheatria,AVnode房室结,bundleofHis希氏束,andPurkinje浦肯野纤维.TheQRSintervalrepresentsthetimeittakesfordepolarization去极化ofbothventricles.TheQTintervalrepresentsthetimeittakesfo
5、rcompletedepolarization除极andrepolarization复极oftheventricles.DysrhythmiaDysrhythmiaisanabnormalcardiacrhythmintermsofthefrequencyoftheimpulse频率,rhythm节律,originsite起源部位,conductionvelocity传导速度andexcitementorder激动次序.ClassificationofDysrhythmia心律失常的分类Abnormalimpul
6、seformation冲动形成异常sinusdysrhythmia窦性心律失常sinustachycardia窦性心动过速sinusbradycardia窦性心动过缓窦性心律不齐sinusarrest窦性停搏ectopicrhythm异位心律Passiveectopicrhythm被动性异位心律Escaped逸博Escapedrhythm逸博心律Activeectopicrhythm主动性异位心律期前收缩PrematureContractionParoxysmaltachycardia阵发性心动过速atrialf
7、lutter房扑,atrialfibrillation房颤ventricularflutter室扑,ventricularfibrillation室颤Abnormalimpulsecomduction冲动传导异常Physiological:生理性:interferenceandseparationofAV干扰和房室分离pathological病理性:blockofSA窦房传导阻滞blockofatrialpathway房内传导阻滞blockofatrioventricularpathway房室传导阻滞Blocko
8、fbundlebranch束支或分支阻滞或室内阻滞房室间传导途径异常:WPW预激综合征Sinustachycardia窦性心动过速Clinicalassociation:Itassociatedwithphysiologicalstressorssuchasexercise,fever,pain,anxiety,hypotension,hypovolemia低血容量,an
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